Python如何对迭代器做切片操作

# 如何对迭代器做切片操作

f = open('test.log')
# f.readlines() 一次性把文件读入到内存当中
# lines = list(f.readlines())
# print(lines[100:300])

# for line in f:
#     print(line)

from itertools import islice

# 100-300行
lines = islice(f, 100, 300)
# 前300行
# lines = islice(f, 300)
# 300行到尾部
# lines = islice(f, 300, None)

# for line in lines:
#     print(line)

l = range(20)
t = iter(l)
# print(list(t))
# islice 会消耗原来的迭代对象
for x in islice(t, 5, 10):
    print(x)

for x in t:
    print(x)